poncho62
Old Fart
My 97 has the 350, 4L60e with tow package, extra trans cooler in front of rad. I have installed a temp gauge also. Since the OBS trucks dont have a tow mode button, I have been advised to not use OD, but to tow in 3rd. My 5th wheel trailer is about 6000 lbs. So far I have had no trouble doing this, but only get about 10 mpg. Any thoughts about using OD to help mileage a bit of flat sections or downgrades, or is that a bad idea? I have been told these trannys have a weak overdrive, so dont want to chance messing it up.